Ab Initio Study of the Mechanical, Thermal and Optoelectronic Properties of the Cubic CsBaF3
M. Harmel a, H. Khachai a, A. Haddou a, R. Khenata b, G. Murtazac, B. Abbar d, S. Bin Omran e and M. Khalfa a
aLaboratoire d'Etude des Matériaux et Instrumentations Optiques, Université Djillali Liabes Sidi Bel-Abbès, Algerie
bLaboratoire de Physique Quantique et de Modélisation Mathématique de la Matière (LPQ3M), Université de Mascara, 29000 Mascara, Algerie
cMaterials Modeling Lab, Department of Physics, Islamia College University, Peshawar, Pakistan
dLaboratoire de Modélisation et Simulation en Sciences des Matériaux, Physics Department, Djillali Liabès University of Sidi Bel-Abbès, Sidi Bel-Abbès 22000, Algeria
eDepartment of Physics and Astronomy, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Received: May 24, 2013; In final form: June 16, 2014
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We have investigated the structural, elastic, electronic, optical and thermal properties of CsBaF3 perovskite using the full-potential linearized augmented plane wave method within the generalized gradient approximation and the local density approximation. Moreover, the modified Becke-Johnson potential (TB-mBJ) was also applied to improve the electronic band structure calculations. The ground state properties such as lattice parameter, bulk modulus and its pressure derivative were calculated and the results are compared with the available theoretical data. The elastic properties such as elastic constants, anisotropy factor, shear modulus, Young's modulus and Poisson's ratio are obtained for the first time. Electronic and bonding properties are discussed from the calculations of band structure, density of states and electron charge density. The contribution of the different bands was analyzed from the total and partial density of states curves. The different interband transitions have been determined from the imaginary part of the dielectric function. The thermal effect on the volume, bulk modulus, heat capacities CV and the Debye temperature was predicted using the quasi-harmonic Debye model, in which the lattice vibrations are taken into account.

DOI: 10.12693/APhysPolA.128.34
PACS numbers: 62.20.de, 65.40.Ba, 65.40.De